Belt replacer



Dec. 19, 1922. 1,438,992. M. FRIEDMAN.

BELT REPLACER, FILED OCT. 3. 1 921.

Patented lilec. l9,

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Bnrir nnrniionia.

Application filed October 3, 921. Serial N0.-'505,O85.1

or been removed for any cause is well known to everybody familiar withfconditionsin shops where there are a large number of belt driven machines, on machines which though not strictly belt driven include some belt driven parts in their makeup, The T6- placeinent of belts has been accomplished with considerable risk of injury either by hand where the pulleys wereaccessible or f by means of a pole or stick and the operation is known to require a degree of skill. The present invention has to do with the provision ota belt replacenwh'ich can be used. absolutely without risk and the operation of which requires no skill; The device of the inventionflwhile it maybe adapted to a flat belt it is shown designed with particular reference to use in connection with round belts or chains. I In the drawings I have illustrated a belt replacer embodying my invention. In the drawings: i i f Figure 1 is a side elevation of the belt replacer, one of the rollers or pulleys liieing cut away :torconvenience 0t illi'istratiom the handle and arm beng broken away;

Figure 2 is a similar view ol? the handle and arm l igure 3 is a front view; lligurea is a section at rightangles to the plane oil? Figure l;

Figure 5 is a plan on a reduced scale.

Referring to the drawings bynumerals,"

the structure as shown includesa rod or arm 1, having asuitable grip or handle 2 at one end, and carrying at its other-end secured tothe rod a block or frame 3 having intersect- 3 ing guide slots rand 5 at right angles to each other substantially at right angles [to the arm and terminating adjacent the end of the block remote from the arm so as to form a stop 6 Mounted in the slots "is a carrier 7 projecting through the said slots side oi": the guide block, the rollers having in their faces, shoulders or'ofi's'ets 12 adjacent their neighboring or inner faces so that the two shoulders; or offsets together form a groove or recess ll. Supported on the car rier parallel to the rod is a pivot or journal 15 for thegripper arms 1.6. .There are two sets of grippers arranged in tongwise rela-' tion like a pair of pliers, one set of grippersbeing in front and theother in therear of the guide block, the arms are crossedat the pivot and the corresponding arms are jointed above the block so that there is in tact one pair of tongs or grippers having two sets of operative endsor fingers 17,

In the form 0'. the apparatus shown the carrier is apertured in a direction at right angles to the arm 1 and the block is provided with a pin also at right angles to the rod or arm 1, which pin is indicated by reference character 19, is set in the guide block, passed through the carrier acting as a guide for the" carrier and there is a spring 20 hearing at its upper end against the end er tlieslot and at the lower end against the carrier which serves to normallyforce the carrier to the lower or outer end of the slot and there is of thearms and'te'nding to'pullthem together andclose the grippers. The gripper arms as foresaid are crossed atthe pivots and have neighboring curved portions just beneath the rod 1 having a cam or wedging action in connection with the rod so that -when thefcarrier 7 sliding verticallyin' the slots, impelled downward or out\vai-ifl by the spring 20, iorced upward or toward the flil'llfllf; are forced apart o'gjiening the grippers I The grippers are further controlled by of thernain rod or arm 1, extending to a point adj acent" the handleat' one end and at a tension spring 21 joining the upper ends 2 rod against the'spring action; the gripper an opening lever: 28pivoted intermed'iately the other end to a point adjacent the grippjers and thereis a slotted guide arinQ-iex tending'upward from the block in which slot there is asliding follower 25having arm 2 rod. 26. This sliding follower 25 has pivotfoot plate 36 by whichit is supported on the' i I The tollower25 is connected to the end. of j the controller arm by connecting tends to move the carrier 7 on Which they. are mounted backward or tor-ward the arm 1,

29 which are pivotally connected at their opposite ends one to-the upper portion of each gripper arm so that they have a toggle action tendlng tospread the arms as the end of the controller armadjacent the handieis' it out of the gllppf the arms in the replacing' operation. 1

Al so,the rollers lil arehollowed out: as to. their inner faces at 1 3 to receive and enclose the gripper fingers 17.. This makes it 1mpossible for the fingers to come incontaet with the pulley .111 any position of the grippers. Also, the slot 5 being shorter than slot 4 limits the downward movement oftheslide block'8 relatively to the rollers.

In operation the belt 30 is placed in the grippers as indicatedin Figures land?) and held by the spring action of the gripper as aci'zuatedby spr ng 21, the gr ppers being opened for this purpose by means of the controller arm23, it being understood thatthe ,belt is oil ofthe driving. pulley and either remains on or has been passed over the.

driven pulley, it is engaged by the belt replacer asjust described, the operator holding the replacer or replacing tool inlany convenient mannerasby the handle 2, places i the belt in contact with the portion of? the periphery of the driving-pulley which is rotating away i from the i drivenfpulley and having brought the tool into such position that the groove 14 between the shoulders 12 ot the rollers 11 on the tool, receives the periphoral portion or the .pulley therein, presses down on the tool towardthe drivingpulley the end of lts traverse and cam means on presssin-g the rollers 11 against said pulley. This pressure received on the rollers ll the carriersliding lot-he slotsl a, provided for this purpose against the tendency of the sprmgQO.

The motion of the carri causes the grippers \vhi'cl'x are p voted thereon to reeede towardglihe arm 1. which in turncauses the grippers to open bythe cantanti-on ofthe rod l-er any suitablecam member which may be substituted therefor, engaging .theintersecting port1ons of the arms at 32,

see Figure 8, Iaszthe resultthe belt isv released in Contact with the periphery o t'the.

block pushes the belt out of the grippers.

The advanta es of thestrueturelare that it u r not only provides a convenient engagement of the belt Without using the hands and thereby risking personal injury, but that it immediately releases the belt when the latter 1S brought in contact with the pulley eliminating' all chance that the tool may be yanked out of the hands of the operator and destroyed by sudden engagement of the belt ith the drivingpulley.

It will also be noted that the offset given to the handle or rod .1 as seen in Figure 5 keeps the hands of the operator out of contact with the belt. V

:1 have thus described specifically and in detail a single embodiment of my invention so that the nature and operation of same may be clearly understood, however, the specific terms hereinare used descriptively rather than in limiting sense, the scopeo'l? the invention being defined in the claims,

VVh-at I claim and desire to secure by Letters Patent is:

'1. A. belt replacer consisting of an arm or handle, aguide mounted'thereon, a sl-id ing carrier eooperating with the guide and max g substantially at right angles to the arm, a roller on said carrier adapted to engage the beltpulley, and grippers pivoted on. said carrier, a spring tending to maintain-the carrier at the end of its traverse and cam means engaging the grippers tending to open the grippers as they move in opposition to; the spring and means tending to close the gripper arms. i

A belt replacer consisting ofan arm,

or handle, guiding means-thereon, a carriermoving along the guide substantially at right angles to the arm, rollers on the carrier ad'aptedto engage the belt pulley and grippers also mountedon said carrier, a spring tending tomaintain the carrier at gaging the grippers tending to open the grippers as they move in opposition to. the

spring and means tending to elose the grippers.

3. A belt replacer consisting of a. guide,

. a manually controlled supporttherefor-haw ing an offset to avoid the belt, a carrier moving along the guide, grippers mounted on the carrier, a spring tending to move the carrier toward one end of the guide, means tendin to close thegrippers and means for.

sliding insaid block substantially at rightv anglesto the arm, a roller on said carrier adapted to engage the belt pulley and gripper. arms also mounted on said carrier, a

spring tending to maintain the carrier at the end of? its traverse and cam means engaging the gripper arms tending to open the grippernrms asthey movo in opposition to the an arm or spring and means tending to close the gripper arms and means extending along the handle toward the end remote from the guide block for opening the gripper arms.

5. A belt replacer consisting of an arm or support, a guide mounted thereon, a carrier cooperating with the guide, jaws pivoted on the carrier, a spring tending to move the carrier toward one end of the guide, means tending to close the jaws, means for opening the jaws as the carrier moves in opposition to the spring and means for opening the jaws by hand consisting of a pivoted arm extending along the support, a guide, a follower moving on said guide, toggle arms pivoted on said follower and one connected. to each of said jaw arms and means connecting said follower to said pivoted arm.

6. A belt replacer consisting of a guide, a manually controlled support therefor, a carrier mounted to move along the guide, grippers on the carrier, a spring tending to -move the carrier toward one end of the guide, means tending to close the grippers and means for opening the grippers as the carrier moves along the guide in opposition to the spring.

7. A belt replacer consisting of a guide, a manually controlled support tllQIB'fO'l', a

carrier cooperating with the guide, grippers pivoted on the carrier, a spring tending to move the carrier toward one end of the guide, means tending to close the gripper arms and means for opening the gripper arms as they move in opposition to the spring, a roller mounted on the carrier to move therewith and hollowed out to receive one 01'? the grippers.

S. A belt replacerconsisting of a guide, a manually controlled support therefor, a carrier cooperating with the guide, grippers pivoted on the carrier, a spring tending to move the carrier toward one end oi. the guide, means tending to close the gripper arms and means for opening the gripper arms as they move in opposition to the spring, a roller on each side of the gripper arms mounted on the carrier to move therewith, the rollers being hollowed out as to their adjacent lateral faces to receivethe grippers.

Signed by me at Baltimore, Maryland, this 24th day of September, 1921.

MAX FRIEDMAN.

lVitnesses PORTER l-I. FLAUTT, ,ARRIE J. R'EELY. 

